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Summary of Significant Accounting Policies (Additional Cash Flow) (Details) - USD ($)
$ in Millions
12 Months Ended
May 12, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Noncash or Part Noncash Acquisitions [Line Items]        
Accrual for purchases of property and equipment   $ 3.5 $ 3.6 $ 2.3
Notes Issued   2.5    
Other noncash expense       (0.2)
Total net adjustment   11.6 12.7 4.0
Adjustments to other comprehensive income related to underfunding of pension and SERP plans and changes in fair value of derivative financial instruments, tax   3.7 7.7 2.5
Dividends declared but not yet paid   $ 5.6 $ 5.6 4.9
Aerospace        
Noncash or Part Noncash Acquisitions [Line Items]        
Earnout payments to former owners       $ 1.4
Warrant        
Noncash or Part Noncash Acquisitions [Line Items]        
Options issued in debt conversion (in shares)   114,778 624,044  
Stock conversion amount   $ 7.6 $ 30.3  
Bond Hedge Transactions - 2017 Notes [Member]        
Noncash or Part Noncash Acquisitions [Line Items]        
Value of shares received     7.5  
2017 Notes        
Noncash or Part Noncash Acquisitions [Line Items]        
Stock conversion amount     $ 7.5  
Debt Conversion, Converted Instrument, Shares Issued     136,347  
2017 Notes        
Noncash or Part Noncash Acquisitions [Line Items]        
Options issued in debt conversion (in shares) 624,044 114,778    
2017 Notes | Bond Hedge Transactions - 2017 Notes [Member]        
Noncash or Part Noncash Acquisitions [Line Items]        
Shares received in noncash transaction (in shares)     136369